Grinding-mill.



H. G. STRAGK.

GRINDING MILL.

APPLICATION FILED JULY 28,1913. 1,1 1 1,770.

THE MIRRIS PETERS ca, PHOTO-LITHQ. WASHINGTON. D. C.

Patented Sept. 29, 1914.

a N l TED sTATEs 1 PATENT OFFICE.

.HENRY o. STRAGK, or owned, New some, assraivon or TWENTY-FOUR ONE-HUN- DREDTI-IS T WALLACE. :o. STRAGK AND TWENTY-FOUR ONE-I-IUNDREDTHS T0 HENRY nasrnack, OF nnooKLYN,. 1\TEw YORK.

. GRINDING-MILL.

T all whom, may) 0mm I Be it known that I, HENRY G. Samson, a citizenof the United States, and a res dent of .Owego, Tioga county, State of New York, haveinven'ted a certain new and useful Improvement l in Grinding-Mills, of

which the following is a specification.

, i This invention ischiefly intended to be applied to mills of the type shown in my- Patent No. 1,014,299, granted September30,

excessive quantities of'air intothe material,

and avoid spilling the material over the rim of the shell. l p

Q In the drawings: Figure 1 isa vertical section of the preferredembodiment of the inirention, Fig.2 isa top view of the same Fig. 3 is a side elevation of the rotary grinders showing the location and Fig. lis a position of the plow thereon. detail. showing a top view of the scrapers and showing the shaft incross-section. Fig.

5 is a top view of the lower grinder showingthe'shaft and keys in cross-section. Fig.1 6

is a bottom view of the upper grinder show ing the shaft impress-section. Figs 7 is a bottoin'view of the lower grinder showing the shaft' in cross-section.

view of 'the shell. Fig. 9 is a vertical sec- .tion of a modification.-' Fig. 10 is a top view of the shaft and spiral conveyer" of the same; and-Fig. 11 is a top view of a ring for holding the scrapers in engagement with the shaft.

Referring to the clrawings',-the inclosing casing 1"is made of suitable material, and

of the proper size. It is attached to a shellv 2, the 'walls of which are preferably in-} .clined,as shown, forming grinding surfaces. l The base of the shell opens intoadischarge pipe 27 which is equipped with a valve 26.

r Within the casing is a rotary grinder l,

which has rotating means, and also preferably has conveyingtmeans Within .it. All of the preceding described parts are preferably made like the equivalent parts whichare.

v Specification of Letters Patent.

Fig. 8fis a top :ward the periphery of the grinder.

Patented Sept. 29, 1914.

(Application filed J' uly 28, 1913. SerialNo. 781,688.

disclosed in my Patent 1074299. In addition to the grinder 4, there is a grinder 3. Only one grinder, 3, is illustrated, but the invention is not limited to a single grinder 3.

V The grinder 3 rotates within the shell and I is adapted to grind the material between its lower face and theshell 2, and to'a'ssist in the grinding ofmaterial between its upper faceand the grinder 4. The grinder 3 is preferablymade in the shape of a disk with a convex bottom face and a concave grinderis preferably concave so that the material contained within the shell will flow from the periphery to the center of the grinder. The grlnder 3 engages with the shaft 5'and is rotated by it by any suitable means, such as feathers 31. The shank of this shaft goes through an opening in the shell 2 and is rotated by any suitable means, such .as by the pulley 25. This pulley is turned by means of a belt (not illustrated). It ispreferably rotated at a relatively high rate of speed. In order to prevent leakage of the material through the opening in the shell, a gland '24 is provided. This gland compresses and retains in position suitable packing material 23'. ,Theshaft 5 is provided with a spiral or screw-thread to act as a' conveyer in'the same manner as the conveyer described in Patent 1,074,299, and also to act as an additional grinding means.

The grinder 4 rotates within the shell in an opposite direction, from that of the grinder 3. It is adapted to grind material between its lowerfaceand the upper face of the, grinder 3. The grinder F4 is preferably made in the shape of a cylinder, with aconical bottom face. This conical bottom face is "best provided" with grooves 32 to assist in the grinding operation. The upper face of the grinder 4 is preferably conical so-that the material contained within the shell will freely flow fromthe center to- The grindert is supported upon a shaft 40. Thisshaft is rotated by any suitable means, such as by the bevel .gears 7 and 8. The rate of speed is preferably much less than that of the shaft 5 and lower grinder 3.

ep rp o uppo t n th sh ft a yoke 6 is provided. They'oke is held-t0 the top of the outer casing by any suitable means, suchas hinges 20, 20, bosses 19, 19' and bolts 15, 15.

The material which is being ground between the grinding surfaces passes to the bottom of the shell 2, and means are pro vided for circulating this material from be lowvthe grinders to above the same, soth at; it may be re-groun'd as many times as de-" sired, in the manner set forth in-myPatent 1074299. This means includes a passagewhichis preferably located within the shaft ing inthe shaft 40 is'also best tapered, as

shown. The spiral will grindmaterialbe tween it and the inner wall of the central opening. To adjust the pressure of the parts, a pressrscrew 28, on an arm 29, is

' provided.

provide a plow 17. Thisplow is carried by lplowis preferablyinclined, as shown inFig.

' mulation ofmaterialuponthe top. ofgrinder of the grinder 4. These scrapers are pr0- For the purpose of-preventing material; from accumulating above the grlnders, I;

the grinder 4, and rotates withit as shown. The outer edge ofthePlow is in close engagementwith the inner walls. of the inclosingvcasing and the shell. .In orderto assist in the downward .flow of the .material, the

3. The arrows in'lFig. 3 illustrate the directions of rotation. of the grinders 3 and tin the embodiment chosen for illustration. :It isobvious thatitwo or more plows maylbe used, andthat they maybe carriediby .the grinder Sinstead of the grinder 4. Theadvantage of rapid grinding .andelevating of the material, withouttthespilling of thematerial over the rim of theshell; is obtained.

by rotating the uppergrinder .bthat carries the plow slowly in onedirection, and rotating the grinder 3 between the .upper one 4 and the bottom of theshell vrapidly in :the other direction. i

For the purposeof preventing the accu- 4: andupon the outside-of the" shaft-e0, I employ scrapers 11, 11. Thesescrapers extend outward from the shaft e0 to theperiphery vided with vertical shanks which engage withthe shaft 40. For the purpose of supporting the scrapers in position, they are 11,151) fthe grinder. 1

provided with rings 22. Theserings surround .the shaft 4E0, and {have ',adjusting means 10 for holding the scrapers in contact.

with the shaft. The scrapers are rotatedby any suitable-means, such asby the. pulley '12 and belt 9, and preferably in the opposite direction to the" shaft 40. The scrapers are .helddown on the grinder 4 by means of a spring 14: attached to the yoke 6. The spring engages with an annular ring 21, which in turn engages with the pulley 12'.

Fig-Sand :Fig. 1 0 illustrate a modifica- -tion vof the invention in which a single grinder is used, and a different {arrange- ,ment of the spiral conveyer for grinding purposes ,is employed. A squared tapered shaftBlis employed. The straightspiral conveyer ,33 is. divided vertically into "two parts. ,These ,parts have grooves on their innerfacesthat are taperediand shaped to accommodate .and cooperate'with thetaper I and shape of shaft 34. The inclined sides of ing the spiral conveyer outward horizontally and cause themtoengage'the inner face of ,the passage and thus efi'ectfgrinding results A clamp 35'-,loosely grips L -i when rotating. anannular ring on thebottomofqthe shaft 34, the degree of,pull on the shaft to expand the spiral conveyer being controlled by a weight attached. to an arm, as I shown.

the shaftpressing against the-inclined faces of the grooves force the vertical halves forn'r' Having now described my invention, I I

claim 1. A gr nd ng m1ll having a casing with a fixed grinding surface; rotating ,superim posed gr nders withm the'casing, means for rotating the grinders, .said means ,rotating 1,

the grinders atv dilferenttrelative speeds.

2. A grinding mill-@having a casing with a fixed grinding surface; rotary superim posed. gr nders ,Wltlllll the casing," and means gfo'rmotatingthe grinders in opposite direc- I V ons to one another.

3. A grindingmillshaving a casing-with a fixed grinding surface; rotary superimposed grinders 'withinzthe casing, and means for rotating the grinders .in opposite direct ens to one another .at 'difi'erent relative Speeds.- r

a. Agrinding mill having-a casing; a ro- .tary grinder .within the, casing, a plow carried by the said grinder and rotating with it, a scraper, engaging with .the grinder and .means for .rotating .the scraper independ- ;5. A grinding mill ihaving acasing; ro- J ,tary superunposed grinders within the casing, a :hollow shaft for supporting the up- .per gr1nder,.a conveyer within a hollow .shaft for causing the. material to pass through :the hollow shaft from below the grindersto .ab0ve1.-the:sarne, a shank on the conveyer, means .on theshank for engaging with :the lower grinder, means for rotating the shankand the hollow shaft, and a plow carried by one of the grinders and rotating with it.

6. A grinding mill havingaoasing; rotary superimposed grinders within the casing, a hollow shaft for supporting the upper grinder, a conveyer within the hollow shaft for causing the material to pass through the hollow shaft from below the grinders to above the'same, a shank on the conveyer, means on the shank for engaging with the lower grinder, means for rotating the shank and the hollow shaft, a scraper engaging with one of the grinders and means for rotating the scraper independently of the grinder.

7 A grinding mill having a casing; rotary superimposed grinders within the casing, a

hollow shaft for supporting the upper grinder, a conveyer within the hollow shaft for causing the material to pass through the hollow shaft from below the grinders to above thesame, a shank on the conveyer,

means on the shank for engaging with the lower grinder, means for rotating the shank and the hollow shaft, a scraper engaging with one of the grinders, means for rotating the scraper independently of the grinder and a plow carried by one of the grinders and rotating with it. p

8. A grinding mill having a casing; 21 rotary grinder within the casing, ascraper engaging with the grinder, and means for rotating the scraper independently of the grinder. v

9. A grlndlng mill having a cas1ng;,ro-

tary superimposed grinders within the casing, a hollow shaft for supporting the upper grinder, a conveyer within the hollow shaft Copies of this patent may be obtained for causing the material to pass through the hollow shaft from below the grinders to I above the same, a shank on the conveyer,

means on the shank for engaging with the lower grinder, and means for rotating the shank and the hollow shaft.

10. A grinding mill having a casing and a rotary grinder therein, means for rotating the grinder, a hollow shaft associated with the grinder, a rotary conveyer within the hollow shaft and means for engaging the conveyer with the inner surface of the shaft to grind the material between the two said surfaces.

11. A grinding mill having a casing and a 4 rotary grinder therein, means for rotating the grinder, a hollow shaft associated with the grinder, a rotary conveyer within the hollow shaft, means for engaging the conveyer with the inner surface of the shaft to grind the material between the two said surfaces and means for adjusting the engaging pressure of the conveyer and shaft.

12. VA grinding mill havinga casing and a rotary grinder therein, means for rotating the grinder, a hollow shaft associated with the grinder, a rotary conveyer within the hollow shaft, said conveyer being tapered and the opening in the shaft also tapered,

and means for imparting relative longitudinal motion to the said conveyer and shaft for engaging the conveyor with the inner surface of the shaft to grind the material between the two said surfaces.

HENRY o. STRAGK.

VVitnessesf HENRY DE LAND STRAoK, ROBERT S. S'rnAoK.

for five cents each, by addressing the Commissioner of Patents,

Wuhington, D. 0." 

